SMI2. RS485 Display. User guide

Contents 1 Safety guidelines... 2 2 Intended use... 3 3 Specification... 4 4 Functional description... 5 5 Installation and commissioning... 6 5.1 Installation... 6 5.2 Programming... 6 5.3 Configuration... 6 5.4 Configuration check... 7 5.5 Factory settings mode... 7 6 Operation... 8 6.1 Slave mode... 8 6.2 Master mode... 8 6.3 Operating parameters... 8 6.4 Alarm logic... 8 6.5 Error display... 9 7 Maintenance... 10 8 Transportation and storage... 11 9 Scope of delivery... 12 Appendix A Dimensions... 13 Appendix B Electrical connection... 14 Appendix C Communication protocol... 15 Appendix D Functions and data transfer... 16 1

Safety guidelines 1 Safety guidelines Please read through the user guide carefully before commissioning the device. Damages that arise from non-observance of the guidelines in the user guide shall be devoid of any liability. The device may only be used in the manner described in this user guide. No technical modifications may be made to the device. The device may not be used if the environmental conditions (temperature, humidity etc.) are not within the limits indicated in the specification. The device may not be used in explosive areas and there may be no chemically active substances in the atmosphere. The device should only be cleaned with a damp cloth. No abrasives or solvent-based cleaners should be used. Non-observance of the safety guidelines may result in damage to the device and injury to users. 2

Intended use 2 Intended use The device is intended for use in a RS485 network and supports the protocols Modbus RTU, Modbus ASCII and akytec. It can operate either as a slave or a master. The field of application of the device includes the control and monitoring of industrial processes. The device can be used in automated systems as a primary or secondary display. The device may only be operated properly installed and in accordance with the specification. Improper use The SMI2 may not be used for medical devices that sustain, monitor or otherwise affect human life or health. The device may not be used in potentially explosive environment. The device may not be used in an atmosphere with chemically active agents. 3

Specification 3 Specification Table 3.1 Specification Power supply 12 / 24 (10.5 30) V DC Power consumption, max. 1.5 W Protocol Modbus RTU/ASCII, akytec Interface RS485 (2-wire bus) Baud rate 2.4 115.2 kbit/s Display LED, 7-segment display, 4-digit Character height 14 mm Display colour red IP Code front IP65, rear IP20 Dimensions 48 x 26 x 65 mm Weight approx. 30 g Protection class III Ambient temperature -25 +55 C Storage temperature -40 +70 C Humidity up to 80% (non-condensing) Galvanic isolation yes 4

Functional description 4 Functional description A 4-digit, 7-segment LED display (red) with 14 mm character height displays data received from the RS485 network, error messages and/or configuration parameters of the device. The secondary voltage source with galvanic isolation guarantees a stable power supply to the device and offers protection against polarity reversal. The RESET button is positioned on the cylindrical surface of the device. The button enables to retrieve the configuration parameters and to restore factory settings, if necessary. The device has the following functions: receiving data from a master device in the slave mode querying data from a slave device in the master mode processing received data according to the set parameters displaying transmitted value displaying transmitted value of a type Int or Word with the set number of decimal points optional flashing function displaying errors if the data transfer is faulty or the received value cannot be displayed (see 6.5) displaying configuration parameters of the device modifying configuration parameters according to data received from the master RESET SMI2 RS485 Converter TTL RS485 Microcontroller Display 8 8 8 8 10.5...30 V DC PS PS Power supply Fig. 1 Block diagram 5

Installation and commissioning 5 Installation and commissioning 5.1 Installation The SMI2 is designed for switch panel mounting in a borehole of Ø22.5 mm (see Appendix A for dimensions). Carefully position the supplied gasket on the display rear surface. Insert the cylindrical part of the device into the borehole and tighten the nut from the rear side of the switch panel. Connect the device to the auxiliary voltage and signal cables in accordance with Appendix B. The factory settings can be changed before assembly if necessary (see Appendix D.3). For this purpose the device must be connected to the RS485 interface of the programming device (PC) and to the auxiliary power supply. For further details see 5.3. Switch panel Gasket Nut Enclosure Fig. 2 Mounting 5.2 Programming The display may only be programmed in the RS485 network with the communications protocol Modbus RTU/ASCII or akytec in the slave mode. The protocol type is specified in the parameter Protocol type (t.pro) (see Table D3). The configuration software Konfigurator SMI2 allows to configure the device via the akytec protocol. The CD with the configuration software is supplied with the device. Further steps are given in 5.3. The parameters are divided into two main groups: the configuration parameters and transmitted data. The configuration parameters are device information, network parameters and operating parameters. The latter determine how the device processes the received information. The configuration parameters are constants and are saved in the permanent memory (Table D3). The transmitted data are variable data exchanged between the master and slave. These are not saved (Table D4). Each parameter has a name consisting of Latin letters (up to four), which can be separated by points. 5.3 Configuration Required steps for configuration: Connect a USB/RS485 or RS232/RS485 converter (not supplied) to the PC Connect the display to the 24 V DC power supply and to the RS485 terminals of the converter according to Fig. B1 Switch on auxiliary voltage Install and start SMI2 configuration software In the menu select Device -> Port configuration and set the parameters to the device factory settings (see 5.5) 6

Installation and commissioning Check connection with the device (menu Device -> Check connection ) A new device can be configured immediately. As soon as the parameter Protocol type (t.pro) is changed and saved, the communication with the device is interrupted. To enable the SMI2 configuration software to communicate with the device again, the Factory settings mode must be temporarily activated. 5.4 Configuration check After the RESET button is pressed for a short time, the display extinguishes for 3 seconds, and all current parameters of the device are then displayed. The parameters are presented in the following way: Parameter name (2 seconds), Parameter value (2 seconds), Pause (1 second), Next parameter. The display order corresponds to the register number from the Table D3, column 2. The RESET button must be pressed for a short time again to terminate the display of parameters. 5.5 Factory settings mode In this mode the device works within the factory settings, whereby the parameters configured by the user are saved and not overwritten. This function can be useful if the device must be configured and its network parameters are unknown. To activate this mode, press the RESET button for more than 2 s. The flashing word Fact is displayed and the device accepts the factory settings (see Appendix D.1). To disable the mode, the RESET button must be pressed again for more than 2 s or the command APLY must be sent by the master. The flashing word Fact then fades out and the device resumes the user parameters. The factory settings are effective as long as Fact is displayed. NOTICE If the network parameters are queried in this mode, the values of the saved user network parameters are returned, not the factory setting. 7

Operation 6 Operation The operating mode is automatically enabled as soon as the device is supplied with power. The device supports master and slave modes. The mode can be set in the parameter dev.r (see Table D3). The factory setting is 0 (slave). 6.1 Slave mode In the slave mode the SMI2 receives the data from the master and processes it in accordance with the operating parameters. The results are shown on the display. 6.2 Master mode To enable the master mode, the parameter dev.r must be set to 1. To do this the Factory settings mode must be temporarily activated (see 5.5). In the master mode the SMI2 sends requests to the slave device in the set cycle (parameter SLA.P). The following parameters must be configured: SLA.A - Address of the slave in the network SLA.r - Register number for the request SLA.P - Query cycle with increment of 100 ms, standard value 10 (= 1 s) SLA.F - Modbus reading function (0x0003 or 0x0004) The transmitted values are displayed in the same way in both modes in accordance with the set operating parameters. NOTICE The master mode supports only the protocol Modbus RTU/ASCII The device cannot be programmed in the master mode. To do this the Factory settings mode must be temporarily activated (see 5.5). 6.3 Operating parameters The complete parameter list is provided in the Table D3. The data type (Int, Word, Float, String, Image) for the data transmission is set in the parameter data. For data types Int and Word the transmitted values are displayed with the set decimal point position (parameter dp). Table 6.1 Decimal point position Parameter dp Display Factor 0 ---- 1 1 ----. 1 2 ---.- 10-1 3 --.-- 10-2 4 -.--- 10-3 The transmitted value is displayed with or without flashing, depending on whether the value lies within or outside the alarm limits, and the set alarm logic. The flashing interval is set in the parameter PF. 6.4 Alarm logic Any exceedance of the alarm limits is displayed by flashing LEDs in accordance with the alarm logic. -Logic (parameter AL.t = 1) the display flashes if the current value lies within the interval (Т Δ) < t < (T + Δ), whereby T is the setpoint of the monitored process value (parameter C.SP) and Δ is the hysteresis (parameter HYST). 8

Operation U-Logic (parameter AL.t = 2) the display flashes if the current value lies outside the interval (Т Δ) < t < (T + Δ). If the parameter AL.t = 0, the function is deactivated. For the String (data = 3) and Image (data = 4) data types alarm logic is not implemented. 6.5 Error display Table 6.2 Error display Display Cause - - There is no data packet within the defined time (parameter t.out). dt.ll Transmitted value is too small, e.g. the number is smaller than -999 dt.hh Transmitted value is too high, e.g. the number is larger than 9999 NOTICE When using string type data, non-representable symbols are displayed as spaces. 9

Maintenance 7 Maintenance The maintenance includes: cleaning the housing and the terminals from dust, dirt and debris checking the fastening of the device checking the wiring (connecting leads, fastenings, mechanical damage) The device should be cleaned with a damp cloth only. No abrasives or solvent-containing cleaners may be used. The safety guidelines in Section 1 must be observed when carrying out maintenance. 10

Transportation and storage 8 Transportation and storage Pack the device in such a way as to protect it reliably against impact for storage and transportation. The original packaging provides optimum protection. If the device is not taken immediately after delivery into operation, it must be carefully stored at a protected location. The device should not be stored in an atmosphere with chemically active substances. Permitted storage temperature: -40 +70 C NOTICE The device may have been damaged during transportation. Check the device for transport damage and completeness! Report the transport damage immediately to the shipper and akytec GmbH! 11

Scope of delivery 9 Scope of delivery SMI2 1 Gasket 1 Mounting nut 1 User guide 1 CD with configuration software 1 12

Appendix A Dimensions Appendix A Dimensions RESET 65 26 48 10 Fig. A1 To prevent the device spinning, the borehole in the front panel must correspond to the dimensions in Fig. A2. Fig. A2 13

Appendix B Electrical connection Appendix B Electrical connection Fig. B1 14

Appendix C Communication protocol Appendix C Communication protocol The device supports the following protocols: Modbus RTU, Modbus ASCII and akytec. The protocol akytec is an internal protocol and is used by the configuration software. C.1 Addressing The device receives an individual address so that it can be addressed selectively. The broadcast address is a reserved address that can be used to address all devices. The individual addresses are from 1 to 247; the address 0 is reserved as a broadcast address. If the device has the address 0, it is addressed with every address, but does not send a response. The device address is set in the parameter Addr. The factory setting is 16. C.2 Master Every participant may send messages. However, these are normally initiated by the master and answered by an addressed slave. A PLC or a PC with an RS232/485 converter and/or USB/RS485 converter can serve as a master in the RS485 network. There may only be one master in a RS485 network. 15

Appendix D Functions and data transfer Appendix D Functions and data transfer The following functions are supported in the Modbus protocol: 03, 04 (read registers) read one or more registers; 06 (write single register) write one register; 16 (write multiple registers) write block of registers; 17 (report server ID) read the device name and the firmware version. Example. Function 17 (Report Server ID) This function is used to read the device name and the firmware version. The example with the device address 12 is shown in Tables D1 and D2 Table D1 Format of the request (Master -> Slave) Address Function code Checksum 12 17 ZZ Table D2 Format of the response (Slave -> Master) Address Function code Data length (byte) Data Checksum 12 17 14 SMI2 VX.YY ZZ Comments The values X and YY are set by the manufacturer. 16

Appendix D Functions and data transfer D.1 Parameters Comment: Default values are printed in bold. Table D3 Configuration parameters Parameter Device name dev Firmware version ver Baud rate bps Data bits Len Parity PrtY Stop bits Sbit Response delay rs.dl Time-out t.out Device address Addr Protocol t.pro Address bits (only akytec protocol) A.Len Last error code n.err Broadband offset Ad.Ad Master/Slave mode dev.r Slave address *) SLA.A Start address *) SLA.r Query cycle*) SLA.P Register no. (dec) Values Data type Comment Device information 0-1 SMI2 Char[8] read only (8 bytes) not displayed 2-3 X.YY Char[4] read only (8 bytes) Network parameters 4 0 2.4 kbit/s byte 1 4.8 kbit/s 2 9.6 kbit/s 3 14.4 kbit/s 4 19.2 kbit/s 5 28.8 kbit/s 6 38.4 kbit/s 7 57.6 kbit/s 8 115.2 kbit/s 5 7 byte 8 6 0 - none byte 1 - even 2 - odd 7 1 one byte 2 two 8 0 45 255 ms byte 9 0 600 s UInt16 (2 bytes) 10 Modbus: 1 16 247 UInt16 akytec: 0 16 2047 (2 bytes) 11 0 Modbus ASCII byte 1 Modbus RTU 2 akytec 12 8 8 bit byte 11 11 bit 13 0 255 At switch on - always 0 byte 16 0 1000 65535 UInt16 (2 bytes) 40 0 Slave byte 1 Master 41 1 16 247 UInt16 (2 bytes) 42 0 65535 UInt16 (2 bytes) read only not displayed see Table D5 43 0 10 255 byte x100 ms 17

Appendix D Functions and data transfer Modbus function *) SLA.F Data type data Decimal point position dp Flash interval PF Alarm logic AL.t Setpoint C.SP Hysteresis (Δ) HYST 44 3 0x0003 4 0x0004 byte Operating parameters 17 0 Int byte 1 Word 2 Float 3 String[8] 4 Image 18 0 (- - - -) byte 1 (- - - -.) 2 (- - -.-) 3 (- -.- -) 4 (-.- - -) 19 200 9999 ms UInt16 (2 bytes) 20 0 off byte 1 -Logic 2 U-Logic 21-22 -999 0.0 +9999 Single (8 bytes) 23-24 0 10.0 9999 Single (8 bytes) Table D4 Transmitted data Comment: not displayed during the Configuration check (see 5.4). Status byte Stat Parameter Data type Int value val.i Data type Word value val.w Data type Float value val.f Data type String value val.s Data type Image value val.p Display mode for data type String and Image ind.m Actual state of the display segments O.Str Standard display mode O.mod Command Aply Register no. (dec) Values Data type Comment 14 0 255 byte Read only Bit 0 EEPROM error Bit 1 Parameter error 25-32768 0 32767 Int16 (2 bytes) 26 0 65535 UInt16 (2 bytes) 27-28 0.0 Single (8 bytes) 29-32 see **) Char [8] default (- - - -) (8 bytes) 33-34 see **) Char [4] default ( ) (4 bytes) 35 0 flashing off byte 1 flashing on 36-37 see ***) Char [4] (4 bytes) 38 0 00 flashing off 0 ВB flashing on 15 0x81 default 0 byte byte read only read only Save changed parameters 18

Appendix D Functions and data transfer Comments *) Available only in master mode **) The display supports the following characters: Figures 0 9; Upper and lower case letters of the Latin alphabet; Symbols " ", "_", " ", "." Examples: 1) char[8] = "A.B.C.D"; 2) char[8] = "ABCD"; 3) char[8] = "ABCD." ***) 4 bytes data shows the status of each display segment. The first byte is reserved for the first digit from the right. The allocation of bits for the individual segments is described in Table D6. D.2 Error codes Table D5 0 Error-free frame transmission 1 Illegal function 2 Set decimal point position larger than 4 3 Write access to read-only memory 33 Framing error 39 Incorrect checksum 40 Descriptor not found 49 Actual memory area smaller than indicated D.3 Segment addressing Table D6 Segment Bit A 7 B 6 C 5 D 4 E 3 F 2 G 1 DP 0 19

Appendix D Functions and data transfer D.4 Symbol presentation Table D7 ASCII code and the symbol presentation ASCII- Code 2. 3. 4. 5. 6. 7..0.1.2.3.4.5.6.7.8.9.A.B.C.D.E.F.. 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O A b C d E F G H i J K L M N O P Q R S T U V W X Y Z _ P Q R S t U V W X Y Z _ a b c d e f g h i j k l m n o a b c d E F G h i J K L M n o p q r s t u v w x y z P Q r S t U V W X Y Z D.5 Examples Example 1 The device with the address 100 should display the text WORD. Request: 64 10 00 1D 00 02 04 57 4F 52 44 C0 07 Device address: 0x64 (100) Function code: 0x10 (16) Starting address: 0x1D (29) Number of registers: 0x02 (2) Data length (byte): 0x04 (4) Data: 0x57(W) 0x4F(O) 0x52(R) 0x44(D) CRC: 0xC0 0x07 Example 2 The device with the address 100 should display the text W.O.R.D.. Request: 64 10 00 1D 00 04 08 57 2E 4F 2E 52 2E 44 2E 90 31 Device address: 0x64 (100) Function code: 0x10 (16) Starting address: 0x1D (29) Number of registers: 0x04 (4) Data length (byte): 0x08 (8) Data: 0x57(W) 0x2E(.) 0x4F(O) 0x2E(.) 0x52(R) 0x2E(.) 0x44(D) 0x2E(.) CRC: 0x90 0x31 20